qemu: allow migration of generic <hostdev> with <teaming>

qemu: allow migration of generic <hostdev> with <teaming>

Commit 010ed0856b and commit db64acfbda introduced the ability to use
the <teaming> element in a generic <hostdev> (previously it could only
be used with <interface type='hostdev'>). However, the patch omitted
one crucial detail - along with parsing the <teaming> element in
<hostdev>, and adding the necessary info to the qemu commandline, we
also need to modify qemuMigrationSrcIsAllowedHostdev() to allow
migration when the generic <hostdev> has a <teaming> element.

https://bugzilla.redhat.com/1927984

Fixes: 010ed0856bb06f439e6fdf44e4f529f53441c398
Reported-by: Yalan Zhang <yalzhang@redhat.com>
Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>